Step-by-step explanation:
The above given expression "72t+8 " have to be factorized by the following methods.
<u>Step 1 : </u>
First we must check both numbers in order to obtain common factor for both ,for this equation "8" is the common factor for both . 
<u>Step 2:</u>
After obtaining the common factor for the equation equation, we must now take the factor as common outside the bracket and form  the equation as follows,
  ⇒ 8 * ( 9*t + 1 )
      Here there are the two factors for the equation " 72 t+ 8 " that are <u>8 </u>and  <u>9t+1.</u>
<u>Step 3 (optional) : </u>
Now check weather the factors are correct or not by multiplying factors with each other.
Multiplying ,
  ⇒ 8 * ( 9*t + 1 )
 Gives -
⇒  72 t+ 8